the mass of an exoplanet is 9 times the mass of the earth and its radius is 4 times the radius of the earth. a) if the mass of a person on the surface of the earth is 80 kg what will be his mass and weight on the surface of the exoplanet? b) if the person can jump to a height of 2 m on the surface of the earth how high can he jump on the exoplanet? c) compare the gravitational potential on the surface of planet a to that of planet b.
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